Thermostat — check and replacement

Attention! Do not remove the radiator cap, drain the coolant, or replace the thermostat while the engine is hot.

Examination

1. Check the coolant level, tension belts and the operation of the coolant temperature sensor.

2. If it takes too long for the engine to warm up, the thermostat may not be fully closing. In this case, it must be replaced.

3. If the engine overheats, check the temperature of the upper radiator hose. If it is cold, then the thermostat is not opening and needs to be replaced.

Attention! Do not drive a car without a thermostat. The computer system will be open, which will increase fuel consumption.

4. If the upper radiator hose is hot, coolant is coming in and the thermostat is open.

Replacement

5. Disconnect the negative battery terminal wire.

6. Drain the coolant.

7. Disconnect the upper radiator hose from the thermostat housing.

8. Locate the thermostat housing located between the upper radiator hose and the engine.

9. If the nipple attached to the hose looks badly worn, removing the hose may cause more damage to it. If this happens, the thermostat cover should be replaced.




10. Unscrew the bolts and remove the thermostat cover (3.10).

11. Get the thermostat from a casing and remember how it was installed.

12. Remove traces of the old gasket and sealant from the surface of the thermostat housing and cover.



13. Install the new thermostat into the housing. Check for correct installation (3.13).

14. Apply a thin coat of sealant to both sides of the new gasket and secure it to the housing.

15. Install the thermostat cover and tighten the mounting bolts to the required torque.

16. Connect the hose, and securely tighten the clamp.

17. Fill in cooling liquid in the cooling system.

18. Start the engine, wait until it warms up, check the thermostat and check for leaks.